2005/08/31 by P. -M. Billangeon, P.-M. Billangeon, F. Pierre +2
Physics and Astronomy · #Absorption (acoustics) #Asymmetry #Biasing #Condensed matter physics #Josephson effect #Mesoscopic physics #Noise (video) #Optics #Physics #Physics of Superconductivity and Magnetism #Pi Josephson junction #Quantum and electron transport phenomena #Quantum mechanics #Quantum tunnelling #Quasiparticle #Semiconductor Quantum Structures and Devices #Superconducting tunnel junction #Superconductivity #Tunnel junction #Voltage #cond-mat.dis-nn #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.96.136804
published as Phys. Rev. Lett. 96, 136804 (2006) · Revtex4, 4 figures
openalex publication_date 2006/04/06 · arxiv created 2006/04/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We measure current fluctuations of mesoscopic devices in the quantum regime, when the frequency is of the order of or higher than the applied voltage or temperature. Detection is designed to probe separately the absorption and emission contributions of current fluctuations, i.e. the positive and negative frequencies of the Fourier transformed nonsymmetrized noise correlator. It relies on measuring the quasiparticles photon assisted tunneling current across a superconductor-insulator-superconductor junction (the detector junction) caused by the excess current fluctuations generated by quasiparticles tunneling across a Josephson junction (the source junction). We demonstrate unambiguously that the negative and positive frequency parts of the nonsymmetrized noise correlator are separately detected and that the excess current fluctuations of a voltage biased Josephson junction present a strong asymmetry between emission and absorption.